I found a theme with a lot of pictures from flicker:
As I know, we can not use pictures except the library.
I want to know why can he use those pictures.
If he bought it, or those pictures are free to use?
You can use Flickr Creative Commons images, with attribution.
If you search the forums you can find many threads about this subject.
Anyway, what I’ve done was contacting some talented graphic designers and illustrators from Creattica and ask them if they allow me to use some screenshots of their work. In return, I put all the links they want on the credits of the file discription.
And, of course, I don not include the images of their work on the main files for download.
Hope that can help you!